Sub-suggestion, once you have a little time: add a radio button group at the top to group alternate designs for the same site - the first one being the non-changed one.

This would be a fantastic addition. And if the styles are inserted into the html with jQuery/javascript, perhaps not that hard to implement?

Yes, this. I found myself constantly removing all the styles to compare the custom version to the original.

Yes me too, actually. Will add something to toggle between the original and the custom website shortly (tomorrow or the day after).

Thanks for the suggestion -- will do!